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Joined: Mar 2006
Sunflowers require a lot of water while they're flowering, and without it their blooms may not grow as large or last as long. And the flowers always start drooping downwards as the weight of the ripening, plumping seeds increases. Wind and hail also take their toll on the leaves, oftentimes leaving them tattered looking by the end of the season. If you're wanting to collect seeds, my understanding is that the seeds are ripe when the back of the downturned flower turns brown/yellow-brown. If it looks like birds are eating the seeds before they ripen, you can cover the flower/seedhead with some stretched out pantyhose or a paper bag.
The great thing about gardening is that you always get a chance to start over!